CVE-2026-33934— OpenEMR's Missing Authorization in show-signature.php Allows Portal Patients to Read Staff Signatures
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-33934
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
OpenEMR's Missing Authorization in show-signature.php Allows Portal Patients to Read Staff Signatures
Source: NVD (National Vulnerability Database)
Vulnerability Description
OpenEMR is a free and open source electronic health records and medical practice management application. Versions prior to 8.0.0.3 have a missing authorization check in `portal/sign/lib/show-signature.php` that allows any authenticated patient portal user to retrieve the drawn signature image of any staff member by supplying an arbitrary `user` value in the POST body. The companion write endpoint (`save-signature.php`) was already hardened against this same issue, but the read endpoint was not updated to match. Version 8.0.0.3 patches the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
OpenEMR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenEMR是OpenEMR社区的一套开源的医疗管理系统。该系统可用于医疗实践管理、电子医疗记录、处方书写和医疗帐单申请。 OpenEMR 8.0.0.3之前版本存在安全漏洞，该漏洞源于portal/sign/lib/show-signature.php缺少授权检查，可能导致已验证患者门户用户通过POST正文中提供任意user值检索任意员工绘制的签名图像。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-33934
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-33934
请登录查看更多情报信息。
- Release v8_0_0_3 · openemr/openemr · GitHubx_refsource_MISC
- fix: ghsa-w9w5-7x6h-657q · openemr/openemr@ae7ee18 · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-33934
Same Patch Batch · openemr · 2026-03-25 · 20 CVEs total
| CVE-2026-33917 | 8.8 HIGH | OpenEMR has SQL Injection in CAMOS Form |
| CVE-2026-33348 | 8.7 HIGH | OpenEMR has Stored XSS in patient encounter Eye Exam form $CHRONIC2 and $CHRONIC3 |
| CVE-2026-29187 | 8.1 HIGH | OpenEMR Vulnerable to Authenticated Blind Boolean-Based SQL Injection in new_search_popup. |
| CVE-2026-34055 | 8.1 HIGH | OpenEMR has IDOR in Patient Notes Web UI allows unauthorized note access/modification |
| CVE-2026-33913 | 7.7 HIGH | OpenEMR: XInclude Injection in CCDA Import Allows Reading Arbitrary Server Files |
| CVE-2026-34056 | 7.7 HIGH | OpenEMR has a Privilege Escalation that Allows a Low-Level User to View Admin-Only Data |
| CVE-2026-33918 | 7.6 HIGH | OpenEMR Missing Authorization on Claim File Download Endpoint |
| CVE-2026-33932 | 7.6 HIGH | OpenEMR has Stored XSS in CCDA Preview via Unsanitized linkHtml Attributes |
| CVE-2026-33910 | 7.2 HIGH | OpenEMR has a SQL Injection Vulnerability in patient selection |
| CVE-2026-33914 | 7.2 HIGH | OpenEMR has SQL Injection in PostCalendar Category Delete |
| CVE-2026-34053 | 7.1 HIGH | OpenEMR Missing Authorization in Procedure Order AJAX Deletion Handler |
| CVE-2026-33931 | 6.5 MEDIUM | OpenEMR has IDOR in Portal Payment Page that Allows Cross-Patient Record Access |
| CVE-2026-32120 | 6.5 MEDIUM | OpenEMR has IDOR in Fee Sheet Product Save |
| CVE-2026-33933 | 6.1 MEDIUM | Reflected XSS via Unescaped contextName Parameter in Custom Template Editor |
| CVE-2026-33909 | 5.9 MEDIUM | OpenEMR Vulnerable to SQL Injection via Unsanitized Variables in MedEx Recall/Reminder Pro |
| CVE-2026-33911 | 5.4 MEDIUM | OpenEMR vulnerable to reflected XSS in graphs.php via title parameter |
| CVE-2026-33912 | 5.4 MEDIUM | OpenEMR has reflected XSS in ajax_download.php via reportID parameter |
| CVE-2026-33915 | 5.4 MEDIUM | OpenEMR Missing ACL Checks on Insurance Company API Routes |
| CVE-2026-34051 | 5.4 MEDIUM | OpenEMR has Improper ACL On Import/Export Popup |
IV. Related Vulnerabilities
Same product: openemr
- CVE-2023-54347
OpenEMR 7.0.1 Authentication Brute Force Mitigation Bypass - CVE-2026-34056
OpenEMR has a Privilege Escalation that Allows a Low-Level U - CVE-2026-34055
OpenEMR has IDOR in Patient Notes Web UI allows unauthorized - CVE-2026-34053
OpenEMR Missing Authorization in Procedure Order AJAX Deleti - CVE-2026-34051
OpenEMR has Improper ACL On Import/Export Popup
Same vendor: openemr
- CVE-2026-34056
OpenEMR has a Privilege Escalation that Allows a Low-Level U - CVE-2026-34055
OpenEMR has IDOR in Patient Notes Web UI allows unauthorized - CVE-2026-34053
OpenEMR Missing Authorization in Procedure Order AJAX Deleti - CVE-2026-34051
OpenEMR has Improper ACL On Import/Export Popup - CVE-2026-33933
Reflected XSS via Unescaped contextName Parameter in Custom
Same weakness: CWE-639
- CVE-2026-8196
JeecgBoot mLogin Endpoint LoginController.java authorization - CVE-2026-42291
SysReptor: Read-write access to personal notes by sharing-li - CVE-2026-44400
MailEnable Enterprise Premium < 10.55 Authorization Bypass v - CVE-2026-42279
solidtime: Time entry update endpoint allows cross-organizat - CVE-2026-42277
Onyx: IDOR in /chat/file/{file_id} allows any authenticated
V. Comments for CVE-2026-33934
No comments yet